The CAL/OSHA Pressure Vessel Unit is responsible under Labor Code sections 7620, et seq., for the inspection of boilers (any fired or unfired pressure vessel used to generate steam pressure by the application of heat), and tanks (any fired or unfired pressure vessel used for the storage of air pressure or liquefied petroleum gases).

Local County Weights and Measures, under the California Department of Food and Agriculture, can take inquiries/complaints on regulation of air compressors at filling stations that require the consumer to insert money into a machine for air, etc. </p>